紧急请教:532nm绿色激光笔的恒流驱动电路!
<p>用808nm红外的LD经过泵浦和倍频转换成532nm的绿色激光笔,</p><p>用的晶体是Nd:YVO4/KTP的绿光胶合晶体,但是我对LD的恒流驱动不怎么明白,嘿嘿,</p><p>急着交论文,就是3V 的干电池驱动,LD的工作电流是350mA左右.不知道这个该怎么写,怎么分析?</p><p>有哪位高手GGJJ给点指导呢?</p><p>不胜感激!</p> 电路图来也!哈哈<br /> <p>天哪,回复太及时了!!!电阻真伟大!</p><p>谢谢谢谢!</p><p>我现在的心情啊,</p><p>感激不尽!</p><p></p> <p>图中那些电容的数值.1uF的意思是0.1uF么?</p><p>呵呵,我电路的知识仅限课本理论,实际工作中常见的电路里的符号数值习惯都不是很懂.</p><p>问这样的问题,不知道会不会被笑哦</p><p>呵呵</p> .1uF是０.１uF,运算放大器可以采用贴片的ＬＭ３５８，Ｄ１可以采用美国美信公司的１．２Ｖ的电压基准．管子可以采用低饱和电压降的ＦＣＸ６１７．（ＳＯＴ８９封装的）． <p>可是LM358在3V下无法工作啊</p> <p>嘿嘿</p><p>能否帮忙解释一下具体怎么实现恒流的啊？就是什么器件起什么作用，电路的每一部分是什么作用？</p><p>谢谢啦！</p> <p class="MsoNormal" style="margin:0cm 0cm 0pt"><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">运算放大器是采用双运算，</span><span lang="EN-US"><font face="Times New Roman">U1A</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">一个作为跟随器，另外</span><span lang="EN-US"><font face="Times New Roman">U1B</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">是作为比较器，</span><span lang="EN-US"><font face="Times New Roman">R5</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">，</span><span lang="EN-US"><font face="Times New Roman">R7</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">，</span><span lang="EN-US"><font face="Times New Roman">R6</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">，和</span><span lang="EN-US"><font face="Times New Roman">D1</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">是形成一个电压基准的，与</span><span lang="EN-US"><font face="Times New Roman">U1B</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">过来的电压进行比较，去控制</span><span lang="EN-US"><font face="Times New Roman">Q1</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">的导通程度。</span><span lang="EN-US"><font face="Times New Roman">R9</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">，</span><span lang="EN-US"><font face="Times New Roman">R10</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">是电压取样电阻，</span><span lang="EN-US"><font face="Times New Roman">R3</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">是保护电阻。通过电流的大小，就改变了</span><span lang="EN-US"><font face="Times New Roman">U1B5</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">脚的电压大小。</span></p><p class="MsoNormal" style="margin:0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun:yes"></span></font></span></p><p class="MsoNormal" style="margin:0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman"><span style="mso-spacerun:yes"></span>R6</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">是调整</span><span lang="EN-US"><font face="Times New Roman">U1A3</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">脚的基准电压大小，是控制恒流电流值的调整点。</span><span lang="EN-US"><font face="Times New Roman">C1</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">，</span><span lang="EN-US"><font face="Times New Roman">C2</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">，</span><span lang="EN-US"><font face="Times New Roman">C3</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">是消除寄生震荡的电容。</span><span lang="EN-US"><font face="Times New Roman">C4</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">是用来吸收尖峰浪涌电流的，用来保护</span><span lang="EN-US"><font face="Times New Roman">LD1</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">的。</span></p><p class="MsoNormal" style="margin:0cm 0cm 0pt"><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">其他就是按钮，电池了。另外</span><span lang="EN-US"><font face="Times New Roman">LM358</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">最小工作电压，根据生产厂家的不同，最低工作电压也不相同，如国家半导体的，就可以工作在</span><span lang="EN-US"><font face="Times New Roman">2</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">。</span><span lang="EN-US"><font face="Times New Roman">4V</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">！其他厂家的一般在</span><span lang="EN-US"><font face="Times New Roman">3V</font></span><span style="font-family:宋体;mso-ascii-font-family:'times new roman';mso-hansi-font-family:'times new roman'">左右。</span></p><p></p><p>实际上电路还可以进一步简化:</p><br />这样运算放大器可以使用LMV321单运算放大器了，LMV321的最低工作电压为1.8V!完全可以适用于3V的电路中了。电压基准使用美信公司的1.2V电压基准：MAX6001EUR，只要电源电压高于基准电压的0.5V就可以很好的工作。你查查相关器件资料就可以做PCB了。剩下的我就不多说了。[此帖子已经被作者于1180918898编辑过] 老大就是老大，敬一个！ 可调电阻边上的一个23封装三极管不知什么型号.请指点!! 是的，把局部拍清楚点也行，如果不是很专门定做的管子应该查的出来。看样子是电压基准
背面的照片那? 电路是不是太复杂了用一个恒流块不就解决了吗 这个电路和激光管的功率有关系吗？ {:5_639:}
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